This frame is designed to be used with 4" embroidery hoops.
There is wiggle room where the hoop is inserted. I used an adhesive weather seal tape (for windows) to create a snug fit. The gap can also be filled with extra fabric, hot glue, cardboard, or whatever your crafty heart finds. I chose to not make it a tight fit because different fabrics with embroidery have different thicknesses.
The holes on the back can be used for magnets. I added a hole in the holes up at the top so that it can be strung for hanging as well.
The author remixed this model.
I created my own circular frame based on the design of the hexagon frame.